diff --git a/semester_1/homework5/sortingStation/CMakeLists.txt b/semester_1/homework5/sortingStation/CMakeLists.txt
new file mode 100644
index 0000000..8c0c6c7
--- /dev/null
+++ b/semester_1/homework5/sortingStation/CMakeLists.txt
@@ -0,0 +1,16 @@
+cmake_minimum_required(VERSION 3.8.0)
+project(sortingStation VERSION 0.1.0 LANGUAGES C)
+
+include(CTest)
+enable_testing()
+
+add_executable(sortingStation main.c
+sortingStation/sortingStation.c
+Stack/Stack.c
+getString/getString.c
+tests/test.c
+)
+
+set(CPACK_PROJECT_NAME ${PROJECT_NAME})
+set(CPACK_PROJECT_VERSION ${PROJECT_VERSION})
+include(CPack)
diff --git a/semester_1/homework5/sortingStation/Stack/Stack.c b/semester_1/homework5/sortingStation/Stack/Stack.c
new file mode 100644
index 0000000..a318291
--- /dev/null
+++ b/semester_1/homework5/sortingStation/Stack/Stack.c
@@ -0,0 +1,107 @@
+#include <stdlib.h>
+
+#include "Stack.h"
+
+typedef struct Node
+{
+    struct Node *next;
+    char value;
+} Node;
+
+typedef struct Stack
+{
+    size_t length;
+    Node *head;
+} Stack;
+
+Stack *createStack(void)
+{
+    return calloc(1, sizeof(Stack));
+}
+
+void deleteStack(Stack **const stack)
+{
+    Node *currentNode = (*stack)->head;
+    while (currentNode != NULL)
+    {
+        Node *temp = currentNode;
+        currentNode = currentNode->next;
+        free(temp);
+    }
+    free(*stack);
+    *stack = NULL;
+}
+
+StackErrorCode addElement(Stack *const stack, const char value)
+{
+    Node *newNode = calloc(1, sizeof(Node));
+    if (newNode == NULL)
+    {
+        return memoryErrorStack;
+    }
+    newNode->value = value;
+    if (stack->head != NULL)
+    {
+        newNode->next = stack->head;
+    }
+    stack->head = newNode;
+    ++(stack->length);
+
+    return okStack;
+}
+
+char getElement(Stack *const stack, StackErrorCode *const errorCode)
+{
+    if (stack->head == NULL)
+    {
+        *errorCode = emptyStack;
+        return 0;
+    }
+
+    Node *temp = stack->head;
+    stack->head = temp->next;
+    char value = temp->value;
+    free(temp);
+    --(stack->length);
+    *errorCode = okStack;
+    return value;
+}
+
+char topElement(Stack const *const stack, StackErrorCode *const errorCode)
+{
+    if (stack->head == NULL)
+    {
+        *errorCode = emptyStack;
+        return '\0';
+    }
+    *errorCode = okStack;
+    return stack->head->value;
+}
+
+char *createString(Stack const *const stack, StackErrorCode *const errorCode)
+{
+    if (stack == NULL || stack->head == NULL)
+    {
+        *errorCode = emptyStack;
+        return NULL;
+    }
+
+    size_t strl = stack->length * 2;
+    char *output = (char *)malloc(strl * sizeof(char));
+    if (output == NULL)
+    {
+        *errorCode = memoryErrorStack;
+        return NULL;
+    }
+
+    size_t i = strl - 1;
+    for (Node *currentNode = stack->head; currentNode != NULL; currentNode = currentNode->next)
+    {
+        output[i - 1] = currentNode->value;
+        output[i] = ' ';
+        i -= 2;
+    }
+
+    output[strl - 1] = '\0';
+    return output;
+}
diff --git a/semester_1/homework5/sortingStation/Stack/Stack.h b/semester_1/homework5/sortingStation/Stack/Stack.h
new file mode 100644
index 0000000..b819d71
--- /dev/null
+++ b/semester_1/homework5/sortingStation/Stack/Stack.h
@@ -0,0 +1,27 @@
+#pragma once
+
+typedef struct Stack Stack;
+typedef enum StackErrorCode
+{
+    okStack,
+    memoryErrorStack,
+    emptyStack
+} StackErrorCode;
+
+// создать пустой стек
+Stack *createStack(void);
+
+// удалить стек
+void deleteStack(Stack ** const stack);
+
+// добавить элемент в стек
+StackErrorCode addElement(Stack *const stack, const char value);
+
+// взять верхний элемент из стека
+char getElement(Stack *const stack, StackErrorCode * const errorCode);
+
+// получить значение верхней ячейки стека, не удаляя ее
+char topElement(Stack const *const stack, StackErrorCode *const errorCode);
+
+// получить строку со всеми значениями стека, где самый правый элемент - самый верхний элемент стека
+char *createString(Stack const *const stack, StackErrorCode * const errorCode);
diff --git a/semester_1/homework5/sortingStation/getString/getString.c b/semester_1/homework5/sortingStation/getString/getString.c
new file mode 100644
index 0000000..3f7a54f
--- /dev/null
+++ b/semester_1/homework5/sortingStation/getString/getString.c
@@ -0,0 +1,37 @@
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+
+#include "getString.h"
+
+char *getString(FILE const * const file, char const endOfLine)
+{
+    size_t len = 0;
+    size_t capacity = 1;
+    char *s = (char *)malloc(sizeof(char));
+    if (s == NULL)
+    {
+        return NULL;
+    }
+
+    for (char c = fgetc(file); c != endOfLine && c != EOF; c = fgetc(file))
+    {
+        s[len++] = c;
+
+        if (len >= capacity)
+        {
+            capacity *= 2;
+            char *tmp = (char *)realloc(s, capacity * sizeof(char));
+            if (tmp == NULL)
+            {
+                free(s);
+                return NULL;
+            }
+            s = tmp;
+        }
+    }
+
+    s[len] = '\0';
+
+    return s;
+}
diff --git a/semester_1/homework5/sortingStation/getString/getString.h b/semester_1/homework5/sortingStation/getString/getString.h
new file mode 100644
index 0000000..6f21e6f
--- /dev/null
+++ b/semester_1/homework5/sortingStation/getString/getString.h
@@ -0,0 +1,8 @@
+#pragma once
+
+#include <stdbool.h>
+#include <string.h>
+#include <stdio.h>
+
+// получить строку из *file до разделителя endOfLine
+char *getString(FILE const * const file, char const endOfLine);
diff --git a/semester_1/homework5/sortingStation/main.c b/semester_1/homework5/sortingStation/main.c
new file mode 100644
index 0000000..b5e4910
--- /dev/null
+++ b/semester_1/homework5/sortingStation/main.c
@@ -0,0 +1,47 @@
+#include <stdio.h>
+#include <locale.h>
+#include <stdlib.h>
+
+#include "sortingStation/sortingStation.h"
+#include "getString/getString.h"
+#include "tests/test.h"
+
+typedef enum ExitCode
+{
+    programFinishedCorrectly,
+    programFailedTests,
+    memoryError
+
+} ExitCode;
+
+int main(void)
+{
+    setlocale(LC_ALL, "Russian");
+
+    if (test())
+    {
+        printf("К сожалению, программа сейчас не работает\n");
+        return programFailedTests;
+    }
+    
+    printf("Введите арифметическое выражение в инфиксной форме: ");
+    char * expression = getString(stdin, '\n');
+    if (expression == NULL)
+    {
+        printf("\nНедостаточно памяти\n");
+        return memoryError;
+    }
+    
+    printf("\nВыражение в постфиксной форме: ");
+    char * ex = createPostfixForm(expression);
+    free(expression);
+    if (ex == NULL)
+    {
+        printf("\nНедостаточно памяти\n");
+        return memoryError;
+    }
+    
+    printf("%s\n", ex);
+    free(ex);
+    return programFinishedCorrectly;
+}
diff --git a/semester_1/homework5/sortingStation/sortingStation/sortingStation.c b/semester_1/homework5/sortingStation/sortingStation/sortingStation.c
new file mode 100644
index 0000000..87a85a7
--- /dev/null
+++ b/semester_1/homework5/sortingStation/sortingStation/sortingStation.c
@@ -0,0 +1,119 @@
+#include <string.h>
+#include <stdbool.h>
+#include <ctype.h>
+
+#include "../Stack/Stack.h"
+#include "sortingStation.h"
+
+static void ignoreSpaces(char const *const expression, size_t *const counter)
+{
+    for (; expression[*counter] == ' '; ++(*counter))
+        ;
+}
+
+static int compareOperators(char const operator1, char const operator2)
+{
+    if (operator1 == '*' || operator1 == '/')
+    {
+        if (operator2 == '+' || operator2 == '-')
+        {
+            return 1;
+        }
+        return 0;
+    }
+    else
+    {
+        if (operator2 == '+' || operator2 == '-')
+        {
+            return 0;
+        }
+        return -1;
+    }
+}
+
+static StackErrorCode moveToOutputStack(Stack *const outputStack, Stack *const operatorsStack)
+{
+    StackErrorCode ec = okStack;
+    for (char currentOperator = getElement(operatorsStack, &ec);
+         currentOperator != '(' && ec != emptyStack; currentOperator = getElement(operatorsStack, &ec))
+    {
+        StackErrorCode ec2 = addElement(outputStack, currentOperator);
+        if (ec2 != okStack)
+        {
+            return ec2;
+        }
+    }
+    return okStack;
+}
+
+char *createPostfixForm(char const *const infixForm)
+{
+    size_t len = strlen(infixForm);
+    size_t counter = 0;
+
+    Stack *outputStack = createStack();
+    if (outputStack == NULL)
+    {
+        return NULL;
+    }
+    Stack *operatorsStack = createStack();
+    if (operatorsStack == NULL)
+    {
+        deleteStack(&outputStack);
+        return NULL;
+    }
+
+    StackErrorCode ec = okStack;
+
+    for (size_t i = 0; i < len; ++i)
+    {
+        ignoreSpaces(infixForm, &i);
+        if (i >= len)
+        {
+            break;
+        }
+        char currentChar = infixForm[i];
+        if (isdigit(currentChar))
+        {
+            ec = addElement(outputStack, infixForm[i]);
+        }
+        else if (currentChar == ')')
+        {
+            ec = moveToOutputStack(outputStack, operatorsStack);
+        }
+        else if (currentChar == '(')
+        {
+            ec = addElement(operatorsStack, currentChar);
+        }
+        else
+        {
+            char top = topElement(operatorsStack, &ec);
+            int comparison = compareOperators(top, currentChar);
+            while (ec != emptyStack && top != '(' && comparison != -1)
+            {
+                char operatorFromStack = getElement(operatorsStack, &ec);
+                ec = addElement(outputStack, operatorFromStack);
+                if (ec != okStack)
+                {
+                    deleteStack(&operatorsStack);
+                    deleteStack(&outputStack);
+                    return NULL;
+                }
+                top = topElement(operatorsStack, &ec);
+                comparison = compareOperators(top, currentChar);
+            }
+            ec = addElement(operatorsStack, currentChar);
+        }
+        if (ec != okStack)
+        {
+            deleteStack(&operatorsStack);
+            deleteStack(&outputStack);
+            return NULL;
+        }
+    }
+    ec = moveToOutputStack(outputStack, operatorsStack);
+    char *output = createString(outputStack, &ec);
+    deleteStack(&operatorsStack);
+    deleteStack(&outputStack);
+    return output;
+}
diff --git a/semester_1/homework5/sortingStation/sortingStation/sortingStation.h b/semester_1/homework5/sortingStation/sortingStation/sortingStation.h
new file mode 100644
index 0000000..fa3f391
--- /dev/null
+++ b/semester_1/homework5/sortingStation/sortingStation/sortingStation.h
@@ -0,0 +1,4 @@
+#pragma once
+
+// получает на вход арифметическое выражение в инфиксной форме, возвращает то же выражение в постфиксной форме
+char *createPostfixForm(char const *const infixForm);
diff --git a/semester_1/homework5/sortingStation/tests/test.c b/semester_1/homework5/sortingStation/tests/test.c
new file mode 100644
index 0000000..1fdd284
--- /dev/null
+++ b/semester_1/homework5/sortingStation/tests/test.c
@@ -0,0 +1,42 @@
+#include <stdlib.h>
+#include <string.h>
+
+#include "test.h"
+#include "../sortingStation/sortingStation.h"
+
+const bool test(void)
+{
+    const size_t testNumber = 6;
+    const char * const testExpressions[testNumber] = {
+        "1 + 2",
+        " ( 2 + 4) * 5",
+        " 2 +    4 *  5 ",
+        " 4 * 6 * 7 * 8",
+        "(1 + (2 - 3) + (7 / 2)) * (1 + 8)",
+        "1"
+        };
+    
+    const char * const answers[testNumber] = {
+        "1 2 +",
+        "2 4 + 5 *",
+        "2 4 5 * +",
+        "4 6 * 7 * 8 *",
+        "1 2 3 - 7 2 / + 1 8 + 8"
+    };
+
+    for (size_t i = 0; i < testNumber; ++i)
+    {
+        char * expression = createPostfixForm(testExpressions[i]);
+        if (expression == NULL)
+        {
+            return false;
+        }
+        int comparison = strcmp(expression, answers[i]);
+        free(expression);
+        if (comparison != 0)
+        {
+            return false;
+        }    
+    }
+    return true;
+}
diff --git a/semester_1/homework5/sortingStation/tests/test.h b/semester_1/homework5/sortingStation/tests/test.h
new file mode 100644
index 0000000..0e483cd
--- /dev/null
+++ b/semester_1/homework5/sortingStation/tests/test.h
@@ -0,0 +1,6 @@
+#pragma once
+#include <stdbool.h>
+
+
+// тесты для функции char *createPostfixForm(char const *const infixForm)
+const bool test(void);