add missing function

app.py

@@ -1,6 +1,18 @@
 from fastai.vision.all import *
 print("Import OK")
 
+
+import string
+
+def getClassName(fileName):
+    fileName = fileName[:-4] # remove extension .jpg
+    names = fileName.split('_')
+    artist = ''.join(name+" " for name in names if name[0] in string.ascii_letters)
+    
+    return artist[:-1] #Remove last space
+
+
+
 learn = load_learner('drawingstyle.pkl')
 print("Loader OK")