Add new file

day1:change_occurrence_of_letter.py

+a='restart'
+b=list(a)
+c=len(b)
+i=0
+while (i<c-1):
+    j=i+1
+    while (j<c-1):
+        if b[i]==b[j])
+            b.remove(a[j])
+            b.insert(j,"$")
+        j=j+1
+"".joina()
+print a
+#output:resta$t
\ No newline at end of file