diff --git a/solutions/c/collatz-conjecture/1/collatz_conjecture.c b/solutions/c/collatz-conjecture/1/collatz_conjecture.c
new file mode 100644
index 0000000..611a557
--- /dev/null
+++ b/solutions/c/collatz-conjecture/1/collatz_conjecture.c
@@ -0,0 +1,13 @@
+#include "collatz_conjecture.h"
+
+int steps(int start)
+{
+    if (start <= 0)
+        return ERROR_VALUE;
+    if (start == 1)
+        return (0);
+    if (start % 2 == 0)
+        return (steps(start / 2) + 1); 
+    else
+        return (steps(start * 3 + 1) + 1);
+}
\ No newline at end of file
diff --git a/solutions/c/collatz-conjecture/1/collatz_conjecture.h b/solutions/c/collatz-conjecture/1/collatz_conjecture.h
new file mode 100644
index 0000000..66b3e4b
--- /dev/null
+++ b/solutions/c/collatz-conjecture/1/collatz_conjecture.h
@@ -0,0 +1,8 @@
+#ifndef COLLATZ_CONJECTURE_H
+#define COLLATZ_CONJECTURE_H
+
+#define ERROR_VALUE -1
+
+int steps(int start);
+
+#endif