fix: if a line contains multiple # characters, there will be issues w… (#238)

* fix: if a line contains multiple # characters, there will be issues when traversing from back to front

* fix: typo

fixtures/comments.env

@@ -1,4 +1,7 @@
 # Full line comment
+qux=thud # fred # other
+thud=fred#qux # other
+fred=qux#baz # other # more
 foo=bar # baz
 bar=foo#baz
 baz="foo"#bar

godotenv_test.go

@@ -477,6 +477,9 @@ func TestErrorParsing(t *testing.T) {
 func TestComments(t *testing.T) {
 	envFileName := "fixtures/comments.env"
 	expectedValues := map[string]string{
+		"qux":  "thud",
+		"thud": "fred#qux",
+		"fred": "qux#baz",
 		"foo":  "bar",
 		"bar":  "foo#baz",
 		"baz":  "foo",

parser.go

@@ -143,9 +143,9 @@ func extractVarValue(src []byte, vars map[string]string) (value string, rest []b
 		}
 
 		// Work backwards to check if the line ends in whitespace then
-		// a comment (ie asdasd # some comment)
+		// a comment, ie: foo=bar # baz # other
-		for i := endOfVar - 1; i >= 0; i-- {
+		for i := 0; i < endOfVar; i++ {
-			if line[i] == charComment && i > 0 {
+			if line[i] == charComment && i < endOfVar {
 				if isSpace(line[i-1]) {
 					endOfVar = i
 					break