Add wcswidth and test

tests/expected/bins_static/string/mem.stdout

@@ -0,0 +1,5 @@
+# mem #
+Correct memchr
+Correct memrchr
+Correct memccpy
+Correct memcmp

tests/expected/bins_static/string/strcat.stdout

@@ -0,0 +1,2 @@
+hello world
+hello world

tests/expected/bins_static/string/strchr.stdout

@@ -0,0 +1,3 @@
+ello
+ld
+1

tests/expected/bins_static/string/strcpy.stdout

@@ -0,0 +1,3 @@
+strcpy works!
+strncpy works!
+strncpy shaaaaaaaaa

tests/expected/bins_static/string/strcspn.stdout

@@ -0,0 +1,2 @@
+2
+6

tests/expected/bins_static/string/strlen.stdout

@@ -0,0 +1,9 @@
+12
+0
+12
+12
+0
+12
+6
+12
+0

tests/expected/bins_static/string/strncmp.stdout

@@ -0,0 +1,6 @@
+-97
+-195
+1
+-255
+-2
+0

tests/expected/bins_static/string/strpbrk.stdout

@@ -0,0 +1,3 @@
+The quick drawn fix jumps over the lazy bug
+lazy bug
+NULL

tests/expected/bins_static/string/strrchr.stdout

@@ -0,0 +1 @@
+strrch PASS

tests/expected/bins_static/string/strsignal.stdout

@@ -0,0 +1 @@
+# strsignal #

tests/expected/bins_static/string/strspn.stdout

@@ -0,0 +1,3 @@
+5
+1
+0

tests/expected/bins_static/string/strstr.stdout

@@ -0,0 +1,5 @@
+rust
+libc we trust
+(null)
+(null)
+RUST

tests/expected/bins_static/string/strtok.stdout

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+I'd_just_like_to_interject_for_a_moment._What_you're_referring_to_as_Linux,_is_in_fact,_GNU/Linux,_or_as_I've_recently_taken_to_calling_it,_GNU_plus_Linux.

tests/expected/bins_static/string/strtok_r.stdout

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+I'd_just_like_to_interject_for_a_moment._What_you're_referring_to_as_Linux,_is_in_fact,_GNU/Linux,_or_as_I've_recently_taken_to_calling_it,_GNU_plus_Linux.