diff --git a/main1 b/main1
new file mode 100644
index 0000000..49a9648
--- /dev/null
+++ b/main1
@@ -0,0 +1,77 @@
+#include <Windows.h> 
+#include <stdio.h>  
+#include <tchar.h> 
+  
+int strlen_my1(char s[]) 
+{ 
+    char* p = s; 
+    while (*p++); 
+    return p - s - 1; 
+} 
+ 
+int strlen_my2(char* s) { 
+    char* p = s; 
+    while (*p != '\0') { 
+        p++; 
+    } 
+    return p - s; 
+} 
+ 
+int strcmp_my(const char str1[], const char str2[]) { 
+    int i = 0; 
+    while (str1[i] != '\0' && str2[i] != '\0' && str1[i] == str2[i]) 
+        i++; 
+    return str1[i] - str2[i]; 
+} 
+ 
+void strcpy_my(char* dest, char* src) 
+{ 
+    while (*dest++ = *src++); 
+} 
+ 
+void strcat_my(char* dest, char* src) { 
+    while (*dest) dest++; 
+ 
+    while (*src) { 
+        *dest = *src; 
+        dest++; 
+        src++; 
+    } 
+ 
+    *dest = '\0'; 
+} 
+ 
+void strchr_my(const char* str, int c, char** result) { 
+    while (*str != '\0') { 
+        if (*str == c) { 
+            *result = (char*)str; 
+            return; 
+        } 
+        str++; 
+    } 
+} 
+ 
+void test_strchr_my() { 
+    const char* str1 = "Hello, World!"; 
+    const char* str2 = "This is a test string."; 
+ 
+    // Пример 1: Поиск символа 'o' в строке "Hello, World!" 
+    char* result1 = NULL; 
+    strchr_my(str1, 'o', &result1); 
+    if (result1 != NULL) { 
+        printf("%ld\n", result1 - str1); 
+    } 
+    else { 
+        printf("NULL\n"); 
+    } 
+ 
+    // Пример 2: Поиск символа 'z' в строке "This is a test string." 
+    char* result2 = NULL; 
+    strchr_my(str2, 'z', &result2); 
+    if (result2 != NULL) { 
+        printf("%ld\n", result2 - str2); 
+    } 
+    else { 
+        printf("NULL\n"); 
+    } 
+}
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