spinoff stringliteral mul into another PR

Signed-off-by: martinvuyk <[email protected]>

stdlib/src/utils/string_slice.mojo

@@ -607,26 +607,6 @@ struct StringSlice[is_mutable: Bool, //, origin: Origin[is_mutable].type,](
         """
         return _atof(self)
 
-    fn __mul__(self, n: Int) -> String:
-        """Concatenates the string `n` times.
-
-        Args:
-            n : The number of times to concatenate the string.
-
-        Returns:
-            The string concatenated `n` times.
-        """
-
-        len_self = self.byte_length()
-        count = len_self * n + 1
-        buf = String._buffer_type(capacity=count)
-        buf.size = count
-        b_ptr = buf.unsafe_ptr()
-        for i in range(n):
-            memcpy(b_ptr + len_self * i, self.unsafe_ptr(), len_self)
-        b_ptr[count - 1] = 0
-        return String(buf^)
-
     # ===------------------------------------------------------------------===#
     # Methods
     # ===------------------------------------------------------------------===#