reorganize dir

Signed-off-by: Mia Steinkirch <mia.steinkirch@gmail.com>

ebook_src/builtin_structures/find_if_substr.py

@@ -0,0 +1,36 @@
+#!/usr/bin/env python
+
+__author__ = "bt3"
+
+
+def find_substr(s1, s2):
+
+    if len(s1) < len(s2):
+        bs = s2
+        ss = s1
+    else:
+        bs = s1
+        ss = s2
+
+    ps = 0
+
+    for c in bs:
+
+        if ss[ps] == c:
+            ps += 1
+        else:
+            ps = 0
+
+        if ps == len(ss)-1:
+            return True
+
+    return False
+
+
+
+if __name__ == '__main__':
+    s1 = 'buffy is a vampire slayer'
+    s2 = 'vampire'
+    s3 = 'angel'
+    assert(find_substr(s2, s1) == True)
+    assert(find_substr(s3, s1) == False)