Add `Contract.generate_interface`

slither/core/declarations/contract.py

@@ -953,6 +953,20 @@ class Contract(SourceMapping):  # pylint: disable=too-many-public-methods
         """
         return all((not f.is_implemented) for f in self.functions)
 
+    def generate_interface(self) -> str:
+        interface = f"interface I{self.name} {{\n"
+        for struct in self.structures:
+            interface += struct.interface_def_str()
+        for var in self.state_variables_entry_points:
+            interface += (
+                f"    function {var.signature_str.replace('returns', 'external returns ')};\n"
+            )
+        for func in self.functions_entry_points:
+            if func.is_constructor or func.is_fallback or func.is_receive:
+                continue
+            interface += f"    function {func.interface_signature_str};\n"
+        return interface
+
     # endregion
     ###################################################################################
     ###################################################################################