Panic when I put an element in and try to generate the root hash

[golangdaddy]

panic: runtime error: index out of range

goroutine 1 [running]: github.com/xsleonard/go-merkle.(*Tree).generateNodeLevel(0xc420057c10, 0xc4203fa390, 0x1, 0x1, 0xc4203fa390, 0x0, 0x0, 0x14678e0, 0xc4203be380, 0x0, ...) /Users/alex/Downloads/go_appengine/gopath/src/github.com/xsleonard/go-merkle/merkle.go:178 +0x306 github.com/xsleonard/go-merkle.(*Tree).Generate(0xc420057c10, 0xc42014a7a0, 0x1, 0x1, 0x14678e0, 0xc4203be380, 0x0, 0x1) /Users/alex/Downloads/go_appengine/gopath/src/github.com/xsleonard/go-merkle/merkle.go:137 +0x4d6 github.com/golangdaddy/simple-ledger/models.(*MainBlock).merkleRoot(0xc420057d78, 0x0, 0x0) /Users/alex/Downloads/go_appengine/gopath/src/github.com/golangdaddy/simple-ledger/models/model_block.go:69 +0x33c github.com/golangdaddy/simple-ledger/models.(*MainBlock).AddTX(0xc420057d78, 0xc420070100) /Users/alex/Downloads/go_appengine/gopath/src/github.com/golangdaddy/simple-ledger/models/model_block.go:48 +0x101 github.com/golangdaddy/simple-ledger/models.(*MainBlock).AddCoinbase(0xc420057d78, 0xc42008c7b0) /Users/alex/Downloads/go_appengine/gopath/src/github.com/golangdaddy/simple-ledger/models/model_block.go:19 +0x17c main.(*App).initChain(0xc42008d440) /Users/alex/Downloads/go_appengine/gopath/src/github.com/golangdaddy/simple-ledger/init_chain.go:13 +0xa3 main.main() /Users/alex/Downloads/go_appengine/gopath/src/github.com/golangdaddy/simple-ledger/main.go:49 +0x4a0

[xsleonard]

Does #8 fix it?