Merge pull request #14 from Dev-MAMOKEY/Feat/subtract#10

Feat/subtract#10

Author: haonkr

src/subtract.py

@@ -0,0 +1,5 @@
+def subtract(a, b):
+    try:
+        return(float(a) - float(b))
+    except ValueError:
+        return "숫자를 입력하십시오."