2 files changed, 40 insertions, 0 deletions
diff --git a/rushs/tinyprintf/my_strstr/my_strstr.c b/rushs/tinyprintf/my_strstr/my_strstr.c
new file mode 100644
index 0000000..36ac439
--- /dev/null
+++ b/rushs/tinyprintf/my_strstr/my_strstr.c
@@ -0,0 +1,34 @@
+#include "my_strstr.h"
+
+#include <stddef.h>
+
+int my_strstr(const char *haystack, const char *needle)
+{
+    if (needle == NULL || *needle == '\0')
+    {
+        return 0;
+    }
+
+    for (int i = 0; haystack[i]; i++)
+    {
+        if (haystack[i] == needle[0])
+        {
+            int j;
+            for (j = 0;
+                 haystack[i + j] && needle[j] && needle[j] == haystack[i + j];
+                 j++)
+            {
+                continue;
+            }
+            if (needle[j] == '\0')
+            {
+                return i;
+            }
+            if (haystack[i + j] == '\0')
+            {
+                return -1;
+            }
+        }
+    }
+    return -1;
+}
diff --git a/rushs/tinyprintf/my_strstr/my_strstr.h b/rushs/tinyprintf/my_strstr/my_strstr.h
new file mode 100644
index 0000000..1b734b2
--- /dev/null
+++ b/rushs/tinyprintf/my_strstr/my_strstr.h
@@ -0,0 +1,6 @@
+#ifndef MY_STRSTR_H
+#define MY_STRSTR_H
+
+int my_strstr(const char *haystack, const char *needle);
+
+#endif /* ! MY_STRSTR_H */